The difference between Bed and Stratum
When used as nouns, bed means a piece of furniture, usually flat and soft, for resting or sleeping on. a prepared spot to spend the night in. one's place of sleep or rest. sleep, whereas stratum means one of several parallel horizontal layers of material arranged one on top of another.
Bed is also verb with the meaning: senses relating to a bed as a place for resting or sleeping. to go to a bed. to place in a bed. to put oneself to sleep. to furnish with a bed or bedding. to have sexual intercourse with.
check bellow for the other definitions of Bed and Stratum
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Bed as a noun (usually after a preposition):
A piece of furniture, usually flat and soft, for resting or sleeping on. A prepared spot to spend the night in. One's place of sleep or rest. Sleep; rest; getting to sleep. The time for going to sleep or resting in bed; bedtime. Time spent in a bed. Marriage. Sexual activity.
Examples:
"My cat often sleeps on my bed.<br />I keep a glass of water next to my bed when I sleep."
"When camping, he usually makes a bed for the night from hay and a blanket."
"Go to bed!  I had breakfast in bed this morning."
"He's been afraid of bed since he saw the scary film."
"I read until bed."
"Too much bed, not enough rest."
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Bed as a noun (printing, dated):
A place, or flat surface or layer, on which something else rests or is laid. The bottom of a body of water, such as an ocean, sea, lake, or river. An area where a large number of oysters, mussels, other sessile shellfish, or a large amount of seaweed is found. A garden plot. A foundation or supporting surface formed of a fluid. The superficial earthwork, or ballast, of a railroad. The platform of a truck, trailer, railcar, or other vehicle that supports the load to be hauled. A shaped piece of timber to hold a cask clear of a ship's floor; a pallet. The flat part of the press, on which the form is laid. The flat surface of a scanner on which a document is placed to be scanned. A piece of music, normally instrumental, over which a radio DJ talks. Any of the sections of a dartboard with a point value, delimited by a wire.
Examples:
"The meats and cheeses lay on a bed of lettuce."
"sea bed;  river bed;  lake bed;  There's a lot of trash on the bed of the river."
"Oysters are farmed from their beds."
"We added a new bush to our rose bed."
"A bed of concrete makes a strong subsurface for an asphalt parking lot."
"The parcels were loaded onto the truck bed before transportation."
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Bed as a noun:
A layer or surface. A deposit of ore, coal, etc. the smallest division of a geologic formation or stratigraphic rock series marked by well-defined divisional planes (bedding planes) separating it from layers above and below. The horizontal surface of a building stone. The lower surface of a brick, slate, or tile. A course of stone or brick in a wall.
Examples:
"the upper and lower beds'"
"rfquotek Knight"
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Bed as a verb (transitive):
Senses relating to a bed as a place for resting or sleeping. To go to a bed. To place in a bed. To put oneself to sleep. To furnish with a bed or bedding. To have sexual intercourse with.
Examples:
"rfquotek Francis Bacon"
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Bed as a verb (transitive):
Senses relating to a bed as a place or layer on which something else rests or is laid. To lay or put in any hollow place, or place of rest and security, surrounded or enclosed; to embed. To set in a soft matrix, as paving stones in sand, or tiles in cement. To set out (plants) in a garden bed. To dress or prepare the surface of (stone) so it can serve as a bed. To lay flat; to lay in order; to place in a horizontal or recumbent position. To settle, as machinery.
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Stratum as a noun:
One of several parallel horizontal layers of material arranged one on top of another.
Examples:
"synonyms: tier"
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Stratum as a noun (geology):
A layer of sedimentary rock having approximately the same composition throughout.
Examples:
"synonyms: bed layer"
"coordinate terms seam"
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Stratum as a noun:
Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
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Stratum as a noun (biology):
A layer of tissue.
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Stratum as a noun:
A class of society composed of people with similar social, cultural, or economic status.
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Stratum as a noun (ecology):
A layer of vegetation, usually of similar height.
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Stratum as a noun (computing):
The level of accuracy of a computer's clock, relative to others on the network.